Cylinder liner



Aug. 17, 1948. w. E. PIELQP; JR.

CYLINDER LINER Filed Jan. 13, 1944 A INVENTOR. BWEPLoR JR.

Patented Aug. l?, 1948 UNTED STATES PATENT @FFME CYLINDER'LINER William E. Pielop, Jr., 'Houston,Tex.

Application January 13, 1944, Serial No. 518,066

Claims.

The invention relates to a pump liner insert whereby the service obtainable from a .pump liner issubstantially extended and the liner is adaptable for various size pistons,

In the operation of various types `of pumps a cylindrical liner is removably positioned in the pump so that when it is subjected to wear that it can be replaced in a minimumof time. With many types of pumps and particularly Where an abrasive liquid is beingr circulated such as the slush pumps used to pump the drilling iiuid in .the rotary method of drilling wells, the liners are subjected .to high pressures and, are subject to considerable abrasion.

Various expedients have-been tried such as case hardening, flame hardening and alloy coating of the liners. These expedients have extended the service or" .the liner somewhat, but the present invention contemplates an insert which may be positioned in a liner after it has lrendered the maximum of service whereby the liner is renewedand an additional extended service may be obtained.

It is therefore one of theobjects of the present invention to provide the combination of a pump liner and aremovable insert therein.

Another object of the invention is to provide an insert `for slush pump Yliners which can be pressed into position in the liner so as to provide a working surface.

Another object of the invention is to introduce and seal an insert in a slush pump liner.

Another object of the invention is to provide in combination with a slush pump'liner an insert and a sealing medium there around to prevent leakage between the liner and insert.

Another object ef the invention is to provide the inside surface of a slush pump liner with a packing assembly to form a seal about an insert which is thereafter introduced into the liner.

Another object or the invention is to seal an insert in a slush pump liner.

Still another object of the invention is to provide an insert for a slush pump liner which is of hard wear resistant material so as to provide a maximum ofservice.

Other and further objects of the invention will be readily apparent when the following description is considered in connection with the accompanying drawings wherein:

Fig, 1 is a vertical sectional View through-aportion oi a slush pump liner and insert assembly iii-accordance with the invention.

Fig. 2 is abroken-detailedsectional view showing the end arrangement rof the insert as it is introduced into the liner.

Fig. 3 shows a modified arrangement for sealing the insert-in theliner. K

'The slush pump Vbody -is indicated generally at 2 and has the opening 3 therein for the reciprocation of the piston rod and the chamber 4 for the inlet .and outlet of the pumped liquid. The chamber 5 at the opposite -end is for the liquid pumped by .the other end of the piston while the opening 6 .is arranged to receive any suitable clamping devices for holdingthe liner 38 .in position. Various .types ,of clamping devices can be used ,and it is not `deemednecessary to illustrate them .f or the purpose of this invention.

A pump body is usually provided with the bearing Yor support surfaces I0 and Il which are spaced .axially of the opening l2. A shoulder i3 serves as a stop for -a complementary shoulder if@ on the outstanding .flange l5 `of the liner 8. The liner ,8 may be .anew liner which vhas been equipped with the ,insert i8 which has the cylindrical bore I9 or it may be a liner which-has-seen previous service and has been worn .to such an extent that vthe .inner surface thereof is uneven, worn irregularly or worn to ,such a size `that the pistons .nolonger maintain a seal therewith. Under these circumstances the inside of the liner will be `machined or otherwise treated to provide a .relatively smooth surface l? of sucha size to receive the .insert i8.

In Fig. .-1 in order .to'insure aseal between the insert and .the liner .theiange -l 5 of the liner has had a recess 2l) machined therein from the inside of the liner and a ,plurality-of `packing rings v2l .are shown as having .been disposed in this recess.

The :insert .i8 may vbe prepared of any suitable ,material which is sucicntly ,hard to vresist abrasion vand ofasuitable thickness so that the bore I8 thereof will be of asize to receive standard diameter pistons. By a hardinsert it is contemplated that the surface-of .theinsert will have aBrinellhar-dness approximating 10B'.

The .insert will .be .of `a size to t snugly Vwithin the surface l1 ofthe liner `and theforward end .25ct `the insert .IB may Ibe tapered at-ZBto facilitate .the passing of the packing 2i as the insert is forced into the liner. It is contemplated, of course, that .the insert will Ybe .positioned in the liner sin a suitable .hydraulic press and in actual practice the liners have been inserted in a hydrauli'c press at a pressure-of 65 tons. After the insert has Ibeen Vproperly positioned the tapered end :25 maybe -cut laway so that the liner and insert will present a smooth end 2l as seen in 'fig. #If desired the right vhand ends of both the liner and the insert may be beveled as at 3l and a bead o'f welding material placed therein if desired. One of the essential features is that there be a seal at'the interface 3B between the cuter periphery of the insert and the inner periphery of the liner se that there will be no leakage or escape of liquids from one side of the pump to the other. It will be noted that the packings 2l form a tight seal with the periphery of the suiicient thickness to make it adaptable for the.

purpose intended.

4 terial forced into said liner and a cement like compound on the periphery of said insert.

5. A cylinder liner assembly comprising a cylinder liner, means thereon to be engaged in holding such liner in working position, and an insert sleeve of a size to be fitted into said liner under pressure, said insert being of a hard wear resistant material to provide a working surface.

Fig. 3 shows a modified arrangement of the n insert wherein the inner surface I'I of the liner 8 is the same as in Fig. 1 except that the flange I5 has not been recessed. The insert I8 will be coated with a Isuitable sealing material 40 and the liner pressed into position under hydraulic pressure. With this construction, the packing 2| has been omitted and the seal accomplished by the semi-plastic or sealing material 40. Various types of material may be utilized which have suiicient adhesive qualities on the one hand to hold the insert in place and suliicient body on the other hand to insure the formation of a seal.

A relatively thin insert of the type here shown can be made much harder than can an entire liner due to the volume of metal present in the liner. The insert has a relatively thin wall thickness so that it can be completely hardened much more uniformly and more readily than can the heavier liner.

The provision of the insert permits a substantial saving in expensive steels because the liner can be made up of any suitable metal rather than of a material which will present a working surface.

When an insert becomes worn it may be replaced and the liner structure used indefinitely which effects a substantial saving on the one Y hand while extending the service and satisfactory operation of the pump on the other hand.

Whatis claimed is: 1. .A liner assembly for slush pumps comprising a hollow cylindrical liner body, a retainer a recess cut into the inner periphery of said liner, a plurality of packing rings fitted into said recess, and an insert of a hard wear resistant material forced into said liner.

A4,5 iiange rib projecting from the periphery thereof,

2. A liner assembly for slush pumps comprising a hollow cylindrical liner body, a retainer ange rib projecting from the periphery thereof, a recess cut into the inner periphery of said liner, a plurality of packing rings fitted into said recess, and an insert of a hard Wear resistant material forced into said liner, and means to retain said insert.

3. A liner assembly for slush pumps comprising a hollow cylindrical liner body, a retainer ange rib projecting from the periphery thereof,

a recess cut into the inner periphery of said liner, a plurality of packing rings fitted into said Vrecess, and an insert of a hard wear resistant material forced into said liner through said packing so as to provide a seal against leakage along the insert.

4'. A liner assembly for slush pumps comprising a hollow cylindrical liner body, a retainer flange rib projecting from the periphery thereof, a recess cut into the inner periphery of said liner, a plurality of packing rings fitted into said recess, and an insert of a hard wear resistant ma- 6. A cylinder liner assembly comprising a cylinder liner, means thereon to be engaged in holding such liner in working position, an insert sleeve of a size to be fitted into said liner under pressure, said insert being of a hard wear resistantimaterial to provide a Working surface, and means to form a seal between said liner and insert sleeve.

7. A cylinder liner assembly comprising a cylinder liner, means thereon to be engaged in holding such liner in working position, an insert sleeve of a size to be fitted into said liner under pressure, said insert being of a hard wear resistant material to provide a working surface, and means to for-m a seal between said liner and insert sleeve comprising a series of packings.

8. A cylinder liner assembly comprising a cylinderliner, means thereon to be engaged in holding such liner in working position, an insert sleeve of a size to be fitted into said liner under pressure, said insert being of a hard Wear resistant material to provide a working surface, and means to form a seal between said liner and insert sleeve comprising a coating of sealing material.

9. A cylinder liner assembly comprising a cylinder liner, means thereon to be engaged in holding such liner in working position, an insert sleeve of a size to be fitted into said liner under pressure, said insert being of hard wear resistantmaterial to provide a working surface, and means to form a seal between said liner and insert sleeve, said liner and sleeve each being beveled at one end to provide a groove, and a bead of Welding material in said groove.

10. A liner assembly for a slush pump comprising a liner in a cylinder, means thereon whereby the liner may be affixed in the cylinder, and a relatively thin insert of hard wear resistant material sealed on the inside of said liner to provide a working surface for the slush pump piston.

WILLIAM E. PIELOP, J R.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 814,491 Westerman Mar. 6, 1906 1,529,911 Norling Mar. 17, 1925 1,584,843 Carroll May 18, 1926 1,737,270 Sargent Nov. 25, 1929 2,108,392 Sanders Feb. 15, 1938 2,204,626 Scott June 18, 1940 2,134,250 Heintz Oct. 25, 1938 2,143,586 Walti Jan. 10, 1939 2,234,142 Janney et al Mar. 4, 1941 2,324,547 Wagner July 20, 1943 2,279,671 Ford Apr. 14, 1942 FOREIGN PATENTS Number Name Date 462,708 England 1937 470,999 England 1937 

